tubes age 123
also how/why swapping tubes is still the only way to be certain. Even a good
tube tester can't give you the critical results that the hands-on approach gives.
Someone on the Collins list was just mentioning how a complete re-tubing of
their KWM-2 was not the great idea they thought it was. Apparently two new
Phillips 6AZ8s were too hot for the rig and caused oscillations. His revised view
is to replace one tube at a time, remember where each tube came from, and
have some known-good replacements to use as substitutes. Replacing the
Phillips with RCAs cured the problem.Good stuff.... de Todd/'Boomer'
KA1KAQ
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Subject: Re: [R-390] Tube Failures
Date: Thu, 24 Apr 2003 17:03:42 -0400
Heater to cathode leakage is an insidious problem which the vast majority of
tube testers out there are not capable of detecting. Even the venerable TV-7 and
TV-10 series cannot detect this problem. This is one very good reason why
serious tube people will own ( and be prepared to pay for ) the Hickok 539
series. Chuck N1LNH
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Date: Thu, 5 Jun 2003 11:08:58 -0700
Subject: [R-390] Low Noise Tubes
How would you select tubes for low noise and get performance???
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Date: Thu, 05 Jun 2003 12:09:56 -0400
Subject: Re: [R-390] Low Noise Tubes
The first RF tube sets the noise floor for the entire radio. If you pull the RF tube
you should hear a decrease in noise. If not there is work to do. Start with an
alignment, check voltages and replace components as necessary. Jim
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Date: Fri, 13 Jun 2003 11:39:16 -0500
Subject: [R-390] fixin' gassy tubes
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